From 4137226813e71bd9a9620d1e7fbf29406f3687a3 Mon Sep 17 00:00:00 2001
From: Reid Kleckner <reid@kleckner.net>
Date: Wed, 17 Jun 2015 17:47:30 +0000
Subject: [PATCH] [fixit] Use overwriteChangedFiles() to deal with Windows
 mapped files

Fixes one instance of PR17960.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239920 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../clang/Rewrite/Frontend/FixItRewriter.h    |   6 +-
 lib/Frontend/Rewrite/FixItRewriter.cpp        |   7 +
 lib/Frontend/Rewrite/FrontendActions.cpp      |   5 +-
 test/FixIt/fixit-large-file.cpp               | 318 ++++++++++++++++++
 4 files changed, 333 insertions(+), 3 deletions(-)
 create mode 100644 test/FixIt/fixit-large-file.cpp

diff --git a/include/clang/Rewrite/Frontend/FixItRewriter.h b/include/clang/Rewrite/Frontend/FixItRewriter.h
index ad828e55ae8..3b1b31e0cde 100644
--- a/include/clang/Rewrite/Frontend/FixItRewriter.h
+++ b/include/clang/Rewrite/Frontend/FixItRewriter.h
@@ -27,7 +27,7 @@ class FileEntry;
 
 class FixItOptions {
 public:
-  FixItOptions() : FixWhatYouCan(false),
+  FixItOptions() : InPlace(false), FixWhatYouCan(false),
                    FixOnlyWarnings(false), Silent(false) { }
 
   virtual ~FixItOptions();
@@ -41,6 +41,10 @@ public:
   ///
   virtual std::string RewriteFilename(const std::string &Filename, int &fd) = 0;
 
+  /// True if files should be updated in place. RewriteFilename is only called
+  /// if this is false.
+  bool InPlace;
+
   /// \brief Whether to abort fixing a file when not all errors could be fixed.
   bool FixWhatYouCan;
 
diff --git a/lib/Frontend/Rewrite/FixItRewriter.cpp b/lib/Frontend/Rewrite/FixItRewriter.cpp
index a3e14f9f020..dc787ac9557 100644
--- a/lib/Frontend/Rewrite/FixItRewriter.cpp
+++ b/lib/Frontend/Rewrite/FixItRewriter.cpp
@@ -81,6 +81,13 @@ bool FixItRewriter::WriteFixedFiles(
   RewritesReceiver Rec(Rewrite);
   Editor.applyRewrites(Rec);
 
+  if (FixItOpts->InPlace) {
+    // Overwriting open files on Windows is tricky, but the rewriter can do it
+    // for us.
+    Rewrite.overwriteChangedFiles();
+    return false;
+  }
+
   for (iterator I = buffer_begin(), E = buffer_end(); I != E; ++I) {
     const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
     int fd;
diff --git a/lib/Frontend/Rewrite/FrontendActions.cpp b/lib/Frontend/Rewrite/FrontendActions.cpp
index 1b5eb2855be..dbc661b7190 100644
--- a/lib/Frontend/Rewrite/FrontendActions.cpp
+++ b/lib/Frontend/Rewrite/FrontendActions.cpp
@@ -48,9 +48,10 @@ FixItAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
 namespace {
 class FixItRewriteInPlace : public FixItOptions {
 public:
+  FixItRewriteInPlace() { InPlace = true; }
+
   std::string RewriteFilename(const std::string &Filename, int &fd) override {
-    fd = -1;
-    return Filename;
+    llvm_unreachable("don't call RewriteFilename for inplace rewrites");
   }
 };
 
diff --git a/test/FixIt/fixit-large-file.cpp b/test/FixIt/fixit-large-file.cpp
new file mode 100644
index 00000000000..a1dab53489c
--- /dev/null
+++ b/test/FixIt/fixit-large-file.cpp
@@ -0,0 +1,318 @@
+// Don't modify the source in place, since it might be readonly.
+// RUN: cp %s %t.cpp
+// RUN: not %clang_cc1 -fixit %t.cpp 2>&1 | FileCheck %s
+
+struct A { int x; };
+int foo(A *p) {
+  return p.x;
+}
+
+// CHECK: error: member reference type 'A *' is a pointer; did you mean to use '->'?
+// CHECK: note: FIX-IT applied suggested code changes
+// CHECK-NOT: error:
+
+// The following comment block makes the file at least 16K, which causes clang
+// to mmap it. This caused an issue with clang on Windows, where you cannot
+// write a file which is currently mapped.
+//
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-- 
GitLab